10000/（1+1.93)^6
    C(4,2)0.5^2*0.5^2
    (-(1/2))*(-(4/3))/(-(1/12))
    0.5*5*（7739.67）*（2.89^2*745.88/2）
    (2100/9365）^（-1/1.48）
    (2000/9365）^（-1/1.48）
    1/4+3/8+3/10
    50×30×0.5
    3+1
    250*200
    (139.53×10^3×8.314×(80.9+273.15))/((4+101.325)×10^3×3600)
    0.712×√(2.153+9.742*(0.006^(2/3)))
    0.712×√(2.153+9.742*(0.005^(2/3)))
    0.712×√(2.153+9.742*(0.004^(2/3)))
    0.712×√(2.153+9.742*(0.003^(2/3) ))
    0.472+2533*0.006^2+11.28*(0.006^(2/3))
    0.472+2533*0.005^2+11.28*(0.005^(2/3))
    0.472+2533*0.004^2+11.28(0.004^(2/3))
    0.472+2533*0.003^2+11.28(0.003^(2/3))
    0.153(1/(0.8×0.027))^2

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